Sprocket



FIG. 1 is a front elevation view.

FIG. 2 is a cross-sectional view at line 2—2 in FIG. 1.

FIG. 3 is a rear elevation view.

FIG. 4 is a side view.

FIG. 5 is a cross-sectional view at line 5—5 in FIG. 4; and,

FIG. 6 is a front perspective view. 

The ornamental design for a sprocket, as shown and described. 